# Inch of water conversions

pressure conversions » inch of water conversionsThe inch of water conversion selector here selects the pressure/stress measurement unit to convert to starting from inches of water (inH2O). To make a conversion starting from a unit of pressure other than inch of water, simply click on the "Reset" button.

## What is inch of water?

The **inch of water** is a non-SI unit of pressure equal to about 249.082 pascals (1 inH2O = 249.082 Pa), the SI derived unit of pressure. It is also equal to 2.49082 hectopascals (hPa), or 0.249082 kilopascals (kPa), or about 0.002458248 atmospheres (atm), or 0.00249082 bars (bar), or 1.868268 millimeters of mercury (mmHg), or 0.036126 pounds per square inch (psi), or 5.2021857 pounds per square foot (psf) or 1.868268 torr (Torr).

The inches of water is the pressure applied by a column of water one inch high at 4 °C in a gravitational field.

The inch of water is a unit of pressure commonly used in the United States for measuring small pressure differences of air and other industrial gases.

*Notes:*

(i) The SI is an abbreviation for the International System of Units

(ii) The density of water at 4 °C is 0.999972 g/cm3 or approximately 1 g/cm3

(iii) According to the General Conference on Weight and Measures, the standard gravity is 9.80665 m/s² (or 32.1740 ft/s²)

*Symbol:*

inH2O

*Plural:*

inches of water

*Also known as:*

**inch water column** (plural: inches water column), inch WC (plural: inches WC)

## Inch of water conversions: direct access

A list with conversions from inches of water to other (metric, imperial, or customary) pressure and stress measurement units is given below.

- inch of water to atmosphere (standard) (inH2O to atm)
- inch of water to atmosphere (technical) (inH2O to at)
- inch of water to bar (inH2O to bar)
- inch of water to barye (inH2O to Ba)
- inch of water to centibar (inH2O to cbar)
- inch of water to centimeter of mercury (inH2O to cmHg)
- inch of water to centimeter of water (inH2O to cmH2O)
- inch of water to decibar (inH2O to dbar)
- inch of water to dyne per square centimeter (inH2O to dyn/cm²)
- inch of water to gigabar (inH2O to Gbar)
- inch of water to gigapascal (inH2O to GPa)
- inch of water to hectopascal (inH2O to hPa)
- inch of water to inch of mercury (inH2O to inHg)
- inch of water to kilobar (inH2O to kbar)
- inch of water to kilogram-force per square centimeter (inH2O to kgf/cm²)
- inch of water to kilogram-force per square millimeter (inH2O to kgf/mm²)
- inch of water to kilopascal (inH2O to kPa)
- inch of water to kip per square inch (inH2O to ksi)
- inch of water to megabar (inH2O to Mbar)
- inch of water to megapascal (inH2O to MPa)
- inch of water to millibar (inH2O to mbar)
- inch of water to millimeter of mercury (inH2O to mmHg)
- inch of water to millimeter of water (inH2O to mmH2O)
- inch of water to millipascal (inH2O to mPa)
- inch of water to newton per square meter (inH2O to N/m²)
- inch of water to newton per square millimeter (inH2O to N/mm²)
- inch of water to pascal (inH2O to Pa)
- inch of water to pieze (inH2O to pz)
- inch of water to pound per square foot (inH2O to psf)
- inch of water to pound per square inch (inH2O to psi)
- inch of water to torr (inH2O to Torr)